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【单选题】
闭环控制系统与开环控制系统相比,( )控制系统结构较简单,容易实现。A.
开环
B.
闭环
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【简答题】After the terrible earthquake, hundreds of people were _________ (home).
【简答题】Two ______ died of cold in that country last winter. A) hundreds old people B) hundreds of old people C) hundred old people D) hundred old peoples
【简答题】People use money to buy food, furniture, books, bicycles and hundreds of other things they need or want. Most of the money today is made of metal or paper. But people used to use all kinds of things a...
【单选题】Two __ died of cold in that country last winter.
A.
hundreds old people
B.
hundreds of old people
C.
hundred old people
D.
hundred old peoples
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